5
4. Installing the refrigerant piping
4.3. Indoor unit (Fig. 4-3)
Installing procedures
1. Slide the supplied pipe cover
2
over the gas tubing until it is pressed against the
sheet metal inside the unit.
2. Slide the provided pipe cover
3
over the liquid tubing until it is pressed against
the sheet metal inside the unit.
3. Tighten the pipe covers
2
and
3
at the both ends 3/4 in. (20 mm) with the sup-
plied bands
4
.
A
Gas tubing
E
Pipe cover
3
B
Liquid tubing
F
Press the pipe cover against the sheet metal.
C
Band
4
G
Refrigerant tubing heat insulating material
D
Pipe cover
2
4.4. For twin combination
Refer to the outdoor unit installation manual.
4.1. Precautions
For devices that use R410A refrigerant
• Use ester oil, ether oil or alkylbenzene oil (small amount) as the refrigera-
tion oil applied to the
fl
ared sections.
• Use C1220 copper phosphorus for copper and copper alloy seamless
pipes, to connect the refrigerant pipes. Use refrigerant pipes with the thick-
nesses speci
fi
ed in the table below. Make sure the insides of the pipes are
clean and do not contain any harmful contaminants such as sulfuric com-
pounds, oxidants, debris, or dust.
Warning:
When installing or moving the air conditioner, use only the speci
fi
ed refriger-
ant (R410A) to charge the refrigerant lines. Do not mix it with any other refrig-
erant and do not allow air to remain in the lines. Air enclosed in the lines can
cause pressure peaks resulting in a rupture and other hazards.
in. (mm)
A24, 30, 36, 42
Liquid pipe
3/8" (ø9.52) thickness 1/32" (0.8)
Gas pipe
5/8" (ø15.88) thickness 3/64" (1.0)
• Do not use pipes thinner than those speci
fi
ed above.
4.2. Connecting pipes (Fig. 4-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 212 °F (100 °C)
or more, thickness of 1/2 in. (12 mm) or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam in-
sulation materials (speci
fi
c gravity of 0.03, thickness of 23/64 in. (9 mm) or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening
fl
are nut.
• Use 2 wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. In-
sulate carefully.
B
Flare nut tightening torque
Copper pipe O.D.
(mm, inch)
Flare nut O.D.
(mm, inch)
Tightening torque
(N-m, ft.lbs)
ø6.35, 1/4
17, 43/64
14-18, 10-13
ø6.35, 1/4
22, 7/8
34-42, 25-30
ø9.52, 3/8
22, 7/8
34-42, 25-30
ø12.7, 1/2
26, 1-3/64
49-61, 35-44
ø12.7, 1/2
29, 1-9/64
68-82, 49-59
ø15.88, 5/8
29, 1-9/64
68-82, 49-59
ø15.88, 5/8
36, 1-27/64
100-120, 71-86
ø19.05, 3/4
36, 1-27/64
100-120, 71-86
C
Apply refrigerating machine oil over the entire
fl
are seat surface.
D
Use correct
fl
are nuts meeting the pipe size of the outdoor unit.
A
Flare cutting dimensions
in. (mm)
Copper pipe O.D.
Flare dimensions
øA dimensions
1/4” (ø6.35)
11/32-23/64 (8.7 - 9.1)
3/8" (ø9.52)
1/2-33/64 (12.8 - 13.2)
1/2" (ø12.7)
41/64-21/32 (16.2 - 16.6)
5/8" (ø15.88)
49/64-25/32 (19.3 - 19.7)
3/4" (ø19.05)
29/32-59/64 (22.9 - 23.3)
in. (mm)
Copper pipe O.D.
B
Flare tool for R410A
Clutch type
1/4” (ø6.35)
0-1/64 (0 - 0.5)
3/8" (ø9.52)
0-1/64 (0 - 0.5)
1/2" (ø12.7)
0-1/64 (0 - 0.5)
5/8" (ø15.88)
0-1/64 (0 - 0.5)
3/4" (ø19.05)
0-1/64 (0 - 0.5)
90
0.5
A
R1/64 to R1/32
45 2
Die
Copper pipe
B
Fig. 4-3
Fig. 4-1
Fig. 4-2
01̲RG79D508H01̲EN.indd 5
01̲RG79D508H01̲EN.indd 5
2009/02/10 9:36:11
2009/02/10 9:36:11
